_# server服务器 port端口号
    _server:
    port: 8090

    spring:
    datasource:
    #连接数据库的驱动
    _driver-class-name: com.mysql.cj.jdbc.Driver
    #url 数据库的地址
    url: jdbc:mysql://localhost:3306/book?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
    #连接数据的用户名
    username: root
    #连接数据库的密码
    password: 123456
    mybatis:
    type-aliases-package: com.example.demo01.mapper
    mapper-locations: classpath:mybatis/*.xml
    configuration:
    #当遇到同样名字的时候，是否允许覆盖注册
    _map-underscore-to-camel-case: true
    ————————————————————
    <?xml version=”1.0” encoding=”UTF-8” ?>
    <!DOCTYPE mapper
    PUBLIC “-//mybatis.org//DTD Mapper 3.0//EN”
    “http://mybatis.org/dtd/mybatis-3-mapper.dtd">



    �